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Comparative compressibility of clinopyroxenes from mantle nodules

Paola Comodi, Francesco Princivalle, Massimilliano Tirone and Pier Francesco Zanazzi
Comparative compressibility of clinopyroxenes from mantle nodules
European Journal of Mineralogy (February 1995) 7 (1): 141-149


Using single-crystal XRD with a diamond-anvil cell, the comparative compressibilities of two clinopyroxenes have been determined, one from a spinel lherzolite nodule from Pico Cabugi, NE Brazil, and the other from a spinel harzburgite nodule from Nemby, Paraguay; the Brazilian sample has more R (super 3+) in the M1 site, more Mg in the M2 site (i.e. lower Ca) and more Al in T than the Paraguayan sample. Cell parameters were determined at various P from 1 bar to 46 kbar, with both crystals together in the diamond-anvil cell. The bulk modulus is similar for both samples at approximately 1160-1170 kbar; for both clinopyroxenes beta (sub b) >> beta (sub c) >>beta <MIV%-3>a (sub sinbeta <D%0>. Greater differences are seen in the epsilon ) (sub 1) /epsilon (sub 3) ratios between the semi-axes of the strain ellipsoid of the two pyroxenes: the higher content of R (super 3+) in the M1 site and the lower Ca in the M2 site of the Brazilian crystal produces a more eccentric (010) section of the strain ellipsoid than for the Paraguay sample.

ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 7
Serial Issue: 1
Title: Comparative compressibility of clinopyroxenes from mantle nodules
Affiliation: Universita di Perugia, Dipartimento di Scienze della Terra, Perugia, Italy
Pages: 141-149
Published: 199502
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 24
Accession Number: 1995-021746
Categories: General geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
Secondary Affiliation: Universita di Trieste, ITA, Italy
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199508
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